Quote:
Originally Posted by DougAdams
The other alternative is to pop the laser in a barlow and look for the doughnut reflected back up the drawtube. I believe this skirts the problems of having your laser out of collimation. I've been using this method and it seems to work fine - very easy. I had to fashion a cap from an old eyepiece cover to fit over the drawtube inside the OTA (bit like the BLUG).
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This is by far the best method. Try rotating your eyepiece tube using the laser without the barlow, and I'll bet your "perfect" collimation changes. With the barlow, things stay stable. Google "barlowed laser" for more info, or look here
http://gmpexpress.net/~tomhole/blaser.pdf
Geoff